//
// DotNetNuke - http://www.dotnetnuke.com
// Copyright (c) 2002-2010
// by Perpetual Motion Interactive Systems Inc. ( http://www.perpetualmotion.ca )
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated 
// documentation files (the "Software"), to deal in the Software without restriction, including without limitation 
// the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and 
// to permit persons to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial portions 
// of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED 
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF 
// CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE.
//

/*=======================================================================
?Copyright (C) Microsoft Corporation.?All rights reserved.
?
  THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
  KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
  PARTICULAR PURPOSE.
=======================================================================*/

using System.Collections.Generic;
using System.Xml;

namespace DotNetNuke.Services.Syndication
{
    /// <summary>
    /// Base class for RSS channel (for strongly-typed and late-bound channel types)
    /// </summary>
    /// <typeparam name="RssItemType"></typeparam>
    /// <typeparam name="RssImageType"></typeparam>
    public abstract class RssChannelBase<RssItemType, RssImageType> : RssElementBase
        where RssItemType : RssElementBase, new() 
        where RssImageType : RssElementBase, new() 
    {

        string _url;
        List<RssItemType> _items = new List<RssItemType>();
        RssImageType _image;

        public RssChannelBase() 
        {
        }

        protected void LoadFromUrl(string url) 
        {
            // download the feed
            RssChannelDom dom = RssDownloadManager.GetChannel(url);

            // create the channel
            LoadFromDom(dom);

            // remember the url
            _url = url;
        }

        protected void LoadFromXml(XmlDocument doc) 
        {
            // parse XML
            RssChannelDom dom = RssXmlHelper.ParseChannelXml(doc);

            // create the channel
            LoadFromDom(dom);
        }

        internal void LoadFromDom(RssChannelDom dom) 
        {
            // channel attributes
            SetAttributes(dom.Channel);

            // image attributes
            if (dom.Image != null) 
            {
                RssImageType image = new RssImageType();
                image.SetAttributes(dom.Image);
                _image = image;
            }

            // items
            foreach (Dictionary<string,string> i in dom.Items) 
            {
                RssItemType item = new RssItemType();
                item.SetAttributes(i);
                _items.Add(item);
            }
        }

        public XmlDocument SaveAsXml()
        {
            return SaveAsXml(RssXmlHelper.CreateEmptyRssXml());
        }

        public XmlDocument SaveAsXml(XmlDocument EmptyRssXml) 
        {
            XmlDocument doc = EmptyRssXml;
            XmlNode channelNode = RssXmlHelper.SaveRssElementAsXml(doc.DocumentElement, this, "channel");

            if (_image != null) 
            {
                RssXmlHelper.SaveRssElementAsXml(channelNode, _image, "image");
            }

            foreach (RssItemType item in _items) 
            {
                RssXmlHelper.SaveRssElementAsXml(channelNode, item, "item");
            }

            return doc;
        }

        public List<RssItemType> Items 
        {
            get { return _items; }
        }

        protected RssImageType GetImage() 
        {
            if (_image == null) 
            {
                _image = new RssImageType();
            }

            return _image;
        }

        internal string Url 
        {
            get { return _url; }
        }
    }
}
